package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    /*路径匹配器，支持通配符*/
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;

        String requestURI = request.getRequestURI();
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };
        boolean check = check(urls, requestURI);
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

        if (request.getSession().getAttribute("employee")!=null){
            Long emId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(emId);
            filterChain.doFilter(request,response);
            return;
        }

        if (request.getSession().getAttribute("user")!=null){
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        response.getWriter().write(JSON.toJSONString((R.error("NOTLOGIN"))));
        return;
    }

    private boolean check(String[] urls, String requestURL) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match){
                return true;
            }
        }
        return false;
    }
}
